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# What is the sum of all the integers from 1 to 80, inclusive?

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Math Expert
Joined: 02 Sep 2009
Posts: 49496
What is the sum of all the integers from 1 to 80, inclusive?  [#permalink]

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31 Aug 2018, 00:03
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Difficulty:

25% (medium)

Question Stats:

76% (00:40) correct 24% (00:53) wrong based on 38 sessions

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What is the sum of all the integers from 1 to 80, inclusive?

(A) 3,200
(B) 3,210
(C) 3,230
(D) 3,240
(E) 3,450

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Manager
Joined: 18 Jul 2018
Posts: 193
Location: India
Concentration: Finance, Marketing
WE: Engineering (Energy and Utilities)
Re: What is the sum of all the integers from 1 to 80, inclusive?  [#permalink]

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31 Aug 2018, 00:13
Sum of the integers from 1-80 is given by n(n+1)/2.

N=80

Sum = 80*81/2 = 40*81 = 3240.

D is the answer.

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Director
Joined: 20 Feb 2015
Posts: 743
Concentration: Strategy, General Management
What is the sum of all the integers from 1 to 80, inclusive?  [#permalink]

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31 Aug 2018, 00:45
Bunuel wrote:
What is the sum of all the integers from 1 to 80, inclusive?

(A) 3,200
(B) 3,210
(C) 3,230
(D) 3,240
(E) 3,450

sum of 1st n terms = $$\frac{n(n+1)}{2}$$
$$\frac{80*81}{2}$$ = 3240
D
What is the sum of all the integers from 1 to 80, inclusive? &nbs [#permalink] 31 Aug 2018, 00:45
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# What is the sum of all the integers from 1 to 80, inclusive?

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